Improvement in planing-machine guides



DAVID BAIT, OF BROOKLYN, N. 'Y., AND GEORGE S. PRINDLE, OF WASH- INGTON,0., ASSIGNORS TO HENRY T. RICHARDSON.

IMPROVEMENT IN PLANlNG-MACHINE GUIDES.

Specification forming part of Letters Patent No. l83,4l8,-dated October17, 1876 application filed August 10, 1876.

To all whom it may concern Be it known that we, DAVID RAIT, of Brooklyn,in the county of Kings and State of New York, and GEORGE S. PRINDLE, ofWashington, in the county of Washington, and in the District ofOolumbia,-have invented'certain new and useful Improvements inAttachments for Planers; anddo hereby declare that the following is afull, clear, and exact description thereof, reference being bad to theaccompanying drawing, making a part of this specification, in which-Figure l is a perspective view of our improved device, a portion of itsupper side being removed to show the construction of its interior; andFig. 2 is a plan view'of the lower side of the same.

Letters of like name and kind refer to like parts in each of thefigures.

In dressing staves, moldings, 850., which have curved or moldedsurfaces, it is necessary that the guides through which the material ispassed should be adjusted with reference to a certain width of the same,and if material having a difl'erent. Width is to be dressed, areadjustment of said guides is required, in order that the position ofthe cutters with relation to the transverse center of said material maybe maintained.

This is more especially true with regard to staves which are formed,transversely, upon the line of a circle that corresponds to thecircumference of the finished barrel, and whether said staves are wideor narrow, the same curve must be maintained, if the stave is guided byone edge only, a wider or narrowe'r stave would have its opposite edgecut away or left too thick.

To remedy these objections is the main design of our invention, whichconsists, principally, in combining with spring presserbars, which arearranged to bear against opposite edges of material being operated upon,mechanism, substantially as described, whereby said presser-bars arecaused to maintain the same relative distances from a central line,substantially as is hereinafter specified.

It consists, finally, in the peculiar construction and combinationofparts of thedevice,

substantially as and for the purpose hereinafter set forth.

1n the annexed drawing, A represents the base of our device, which has arectangular form in plan view, and at each edge is provided withvertical sides B, that extend upward sutficiently to furnish space forthe operative mechanism, and at their upper edges are each provided witha plate, 0, which extends horizontally inward until only a sufficientspace is left between its inner edge and the corresponding edge of theopposite plate G t to permit the cutters to operate freely within thesame. Within the space between the base A and each plate 0 are looselyfitted two or more presser-bars, D, each of which is held inlongitudinal position, While permitted to move freely laterally, by*means of two studs, E, that are placed near its ends, and projectupward into corresponding transverse slots 0, that are provided in saidplate O. A spring, F, placed in rear of each bar D, holds the sameinward with a yielding pressure. If, now, the springs F exactlycorrespond in strength, and exert a uniform pressure upon the bars D atall points between theinner and outer limits of the motion of thelatter,a piece of board or a stave passed longitudinally between the oppositepresser-bars will be held at the exact transverse center of the device,regardless of its width; but, should one of said springs be weaker ormore flexible at some point than at others, the stronger spring at theopposite side will press the article being held out of the center. Toobviate this difficulty a stud, G, projects from the lower side at thelongitudinal center of each bar D, downward through a transverse slot,at, which is provided in the base-plate A, and has such width as to justpermit said stud to move without unnecessary friction. To the lower endof each stud G is pivoted one end. each of two bars, H, which, fromthence, extend outward in opposite directions, and toward the center ofthe plate A, and at such point have their opposite ends pivoted to orupon a block, I, that fits nicely to, and slides within, a centrallongitudinal slot orgroove, a, which is formed in said plate A.

TENT GFrron.

' It. now, one presser-bar D moves outward, its bars H will draw thesliding blocks I toward each other, and, by means of the bars'H of theopposite presser-bar, will force the latter outward, the degree ofmotion of one presseiabar being thus caused to correspond exactly tothat of the other bar.

In order that the device may be utilized for the purpose of'dressing theedges of the material being operated upon, a plane-iron, K, may befitted within each presser-bar D, and arranged to cut a shaving from theedge of said material as the latter is moved along; or a rotarycutter,L,may be journaled within said presser-bar, and driven by a beltor other suitable means.

The device thus constructed is intended for use upon the bed of a planerby being fastened thereto, and so that any ordinary feed and planingmechanism can be employed for movin g the staves or boards, and fordressing their sides.

Having thus fully set forth the nature and merits of our invention, whatwe claim as new 1. In combination with the bars I), arranged to bearwith a yielding pressure against the edges of material being operatedupon, the bars;H, pivoted togetherand to said bars D, in the manner andfor the purposesubstantially as specified.

2. lhe frame composed of the plate A, sides B, and top plate C, theresser-bars D, the guide-studs E and G, the springs F, the pivotal barsH, and the guide-blocks I, all constructed and combined to operate inthe manner and forthe purpose substantially as set forth.

In testimony that we claim the foregoing we have hereunto set our hands.

DAVID BAIT. Witnesses: GEO. S. PRINDLE.

JOHN EADIE, A. SCLETTENWERF, H.'G. HAZARD, WILLIAM FITCH.

